超声波测距yes\chao .............\chao.hex .............\chao.lnp .............\chao.M51 .............\chao.Opt .............\chao.plg .............\chao.Uv2 .............\chao_Opt.Bak .............\chao_Uv2.Bak .............\STARTUP.A51 .............\Text1.c .............\Text1.LST .............\Text1.OBJ .............\超声波测距模块.doc 超声波测距yes